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// removes Order Notes Title - Additional Information
add_filter( 'woocommerce_enable_order_notes_field', '__return_false' );



//remove Order Notes Field
add_filter( 'woocommerce_checkout_fields' , 'remove_order_notes' );

function remove_order_notes( $fields ) {
     unset($fields['order']['order_comments']);
     return $fields;
}